Thursday, July 23, 2026 - San Antonio is already heating up under clear skies and is on track to hit the low triple digits this afternoon, with a high near 101°F and heat index readings in the low 100s. A Heat Advisory remains in effect, and officials warn that prolonged time outside can quickly turn into heat-related illness. North-northeast winds around 5-10 mph, with gusts up to 25 mph, will offer only light relief, and muggy overnight lows are expected to linger near 79°F.
Afternoon Heat Advisory
The National Weather Service has a Heat Advisory in effect until 8:00 p.m. CDT on Thursday, July 23, 2026, for much of South-Central Texas, with a forecast high near 101°F and heat index values around 107. In other words, this is not the afternoon to test your limits outdoors. Prolonged outdoor activity is strongly discouraged. The advisory highlights staying hydrated, skipping strenuous midafternoon work, and checking on neighbors without air conditioning as key precautions. For updates, head to NWS Austin/San Antonio. Gusts up to 25 mph are possible this afternoon as a weak Gulf circulation keeps low-level winds elevated.
Tonight: Spotty Tropical Showers Possible
A sheared tropical circulation in the northwestern Gulf will likely keep most of its rain well south of the city, but a stray shower or brief downpour could sneak into the area after 10:00 p.m. on Thursday, July 23, 2026. The chance of precipitation sits around 30 percent, and any totals should stay under one tenth of an inch. Northeast winds of 5-15 mph overnight could still produce gusts to 25 mph, so if showers develop, expect them to be brief and very localized.
Weekend Outlook
Friday into the weekend looks only slightly cooler, with highs generally in the mid to upper 90s and afternoon feels-like temperatures still near or above 100°F. Drier air should help limit widespread storms through the weekend, but humidity will stay stubbornly high for outdoor events. In short, it will feel like classic San Antonio summer: hot, sticky, and not especially forgiving.
Heat Safety And Cooling Options
City cooling sites - including libraries, community centers, and senior centers - remain available during extreme heat, offering a critical lifeline for residents whose homes do not have reliable air conditioning. Neighbors without AC are most at risk and should be checked on, especially during the peak afternoon hours. For a current list of cooling locations and heat safety tips, visit the City of San Antonio's heat resources page at City of San Antonio.
